Pump



Oct# 25 1927 w. H. FuRNEss PUMP Filed oct. z, 1924 INVENTOR mw www Mae# ATTORNEYS V20 discharge outlet or nozzle.

Patented Oct 25, 1927.l

UNITED s'rAr l s PATENT oFFIcE.

WILLIAM II. Funimss, or NATIONAL PARK. NEW JERSEY, AssIGNon 'ro cELLocInx COMPANY, OF PHILADELPHIA, PENNSYLVANIA, .A

CORPORATION F DELAWARE.

PUMP.

. Application led October 2, 19.241.` Serial No. 741,134.

fective .Without *stopping the; driving deviceV and withouttheuseoffjvalves or other fluid cut-off means.`A .i 'j j v Still another vobjectief:my invention .is the provision o f a pump in which the `pres- `sureand quantity of outputniay 'be varied without changing'the speed of'thedriving `11S-.mechanismand'without the use'of reducing "valves Still'another-object of-. `my .invention is A'theprovision of a pump which when. made inetectivefwillchange the position of the Still another objectis 'a lll-.BP

prevented bythe pressure the lprovision of within the. pump.

, A pump.. having the above characteristicsl 2 5 among other uses is particularly useful in the viinanufacture of articial silkV thread.

How the foregoing together with such other objects and advantages as may hereinafter appear. or are incident to my invention, are obtained is illustrated in 'the 'accompanying drawings -in preferred form wherein Fig. 1 is a partial elevation and section of my pump taken substantially on the line 1-1 of Fig. 3. Y e

Fig. 2 is al plan view of Fig. 1 with the cover plate removed. l

Fig is an end elevation looking toward the right in Fig. 1, with some of the parts broken away and showing a tank containing a bath.

Fig. 4 is'an inverted view of the cover plate. v Referring to the drawings the reference character A denotes f the pump base which carries the pump body B, and the drive shaft C having 4worm drive connection to the pressure creating means as indicated at D and a pulley E for connection tov the source of power which connection, however, may be made direct to the shaft C. The pressure creating means is composed of an-internal gear 7 mounted for rotation in the body B, a rotatable external gear or pinion 8 mounted to mesh with the internal wheel 13` of the worm drive D.

in which .leakage 'is automatically gear, and amember 9 pivotcd ai l0 in the crescent like spacev between the non-meshing portions' of thel gear. The pinion 8 is .slim ably splined to the' shaft 11 by means ol' :i key 12, which shaft is rotated by the worin The portion 11EL of the shaft is slightly rounded so that the'machining of the gear and body need not be extremely accurate. The gear is thus prevented from cutting into the body which `would'bethe case if it were securely fast cned to the shaft. Thus it will be seen that rotativemovement of the pinion 8 in the direction' of the arrow is imparted in the same direction to the internal gear 7.

The crescent-like space above referred to is divided'into an intake chamber a and a pressure chamber b by the member 9', said chambers having a height equal tothe width of the internal gear and pinion. the lower wall being formed by the portion 14 of the body B and the upper-wall being Jformed byfthe disc-like cover plate 15. This cover plate 15 is held in place by meansof the nut 16 and servestdhold'the gears ragainst displacement. A fluid inlet opening is provided at 17 in the inlet chamber and a pressure discharge outlet 18 is provided in the cover 4plate said outlet communicating with the pressure chamber b by means of a passage 19 in the cover plate located adjacent the endV of the length of tooth contactat the pressure chamber side in which area pressure conditions are best.

The advantages realized by the use of internal gears asa pressure creating means are manifold. Among others are the great4 length of tooth contact which reduces the leakage from the pressure to the intake chamber to a. minimum and makes for long life and quiet running of the gears; the close centre distance'of the gears enabling the use of large .gears pump excessive. in size and the peculiar way in which the space between gears may be divided into an inlet and pressure chamber.

In operation, the pump as thus far described, takes in ui'd at 17 passes fluid from the intake chamber to the pressure chamber by means of the pockets formed between teeth of the gears by virtue of the member 9 engaging. the tops of such teeth, and discharges the fluid thru the outlet 18 at a 'pressure determined by the speed of the pump, the size of the outlet and the amount of leakwithout making the age past the meshing teeth of the gears. A ygauge 18al is provided above the discharge outlet for indicating the pressure condition within the pump. As a means for varying the pressure output of the pump, in a simple and novel manner, I have mountedthe pinion shaft 11 in a bearing 20 having an eccentric bore and carried by the sleeve-like extension 20 of the pump body. By virtue of this I am enabled to change the relation of the gears, that is to say they may be po- `sitioned in tight or loose mesh, within the range of effective driving` mesh of the gears. .11s a means for adjusting the eccentric bearing i have shown a handle 21 screw threaded into the eccentric bearing and passing through an elongated slot 21 in the extension 20 of the body, which slot serves to limit the amount of adjustment. Thus by varying the relation of the gears the pressure output of the pump may be. varied. By screwing the handle up tight the shaft may be locked in-adjusted position. but adjustment is made by swinging the handle 21 to one side or the other of the elongated slot 21 In this connection it is pointed out that the pivoted member 9 is split at its free end as clearly shown in Fig. 2, thus making the member resilient to allow the. aforesaid change in relation of the pump gears. Furthermore, it will be seen that by so constructing the member 9. proper Contact is main- `tained between it and the teeth of the pump gears. the member serving as a means in itself compensating forwear of the contacting surfaces.

Leakage past the shaft and eccentric bushing is automatically prevented by the pressure within the pump, such pressure bearing down on the shaft by reason of the passage 19 extending across the upper surface of the shaft and causing the enlarged portion 22 of the shaft to make a seal at the seat 22a in the eccentric bushing which in turn causes the enlarged portion 23 of the bearing 20 to close tightly on its seat 20a.

.The pump body B is mounted in the base for swinging movement to which end it is pivoted at 24 by means of pivot pins 25 and 26.l The pins 25- and26 are provided with head portions 27 having upwardly extending lugs adapted to be riveted to the body B, the

'heads of the pins serving to hold the body against displacement. In this instance fluid is introduced to the inletchamber through a f passage 28 extending through the pin 26,

suitable swinging connection being made at 29 to the supply pipe.

a The pivotal mounting of the pump body just 'described is for the purpose of throwing the worm wheel 13 into and out'of mesh with the worm of the worm drive C. This may be accomplished by manipulating the screw 30 which engages the shank or extension 20 of the body below the pivot. vIt will be seen that by turning the screw outward the body may be swung until the worm wheel becomes disengaged from its worm, whichl at the same time withdraw the/dischargey pipe from the tank. Such an arrangement is particularly desirable when the pump is used for spinning filaments to be subsequently twisted into a thread, which is the procedure followed in making artificial silk thread. When so used the Huid supplied to the pump is of a substance which will gel when forced through restricted openings under pressure into a treating bath.

By actual test it has been found that very high pressures may be obtained from a pump of relatively small size in comparison with other gear pumps now in use.

While my invention has been described for use as a pump it is obvious by reversing its operation it may be used as a meter, that is to say fluid may be passed through under pressure and measured by the speed of the gears.

I claim l. A pump including a pump body, Huid pressure crea-ting means carried in said body comprising, an internal gear and pinion and means for altering the relation of said gear and pinion whereby pressure and capacity conditions may be varied.

21A pump of the character described comprising in combination a casing, an internal gear and pinion, a shaft for said pinion, an eccentric bearing for the shaft, and means for shifting the bearing for altering the pressure output of the pump.

3. Apump comprising in combination, an internal gear and pinion, means for varying the meshing relations between gear and pinion, a resilient member dividing the space between the gear and pinion, an inlet to one space, an outlet from the other space, and means for driving the gear and plnion.

d. A pump comprising in combination, an internal gear and pinion. a resilient member dividing the space between they gear and pinion, an inlet to one space. an outlet from the other space, and means for driving the gear and pinion.

5. A pump, comprising a casing, nressure and pinion, of said gear and pinion, a resilient member dividing the crescent like space between the non-meshing portions of the gearsinto a fluid intake chamber and a pressure chamber,'and'functioning to form means whereby-iuid may be passed from one chambel to the other. i

6. A pump comprising in combination, pump gears. a. drive shaft lfor one of said gears having an enlarged portion, a bearing for the drive shaft having a seat portion, said `enlarged portion being pressure -held to said seal portion to form a seal between the shaft and bearing.

7. pump comprising in combination, pump gears. a drive shaft for one of said gears having an enlarged portion, a bearing for the drive shaft having a seat portion. said enlarged portion being held to the seat portion by the pressure discharge of the pump.

S. A pump comprising ay casing, an internal gear and pinion, a'member dividing the crescent like space between the gear and pinion into two chambers, af fluid inlet for one chamber. a pressure discharge out-let, a passage between the other chamber and the outlet. a shaft for the pinion having an end lsubject to the pressure within said passage, and means in association with the shaft for maintaii'iing a seal against leakage of fluid past the shaft. said means being made effective b r the pressure on the shaft.

9. A pump of the character described comprising in combination a. casing, an internal gear and pinion, a shaft for said pinion, a bearing for said shaft carried by the casing, means whereby a tight seal against leakage of Huid is maintained between the pinion shaft and bearing, and means whereby a means for altering the relation` tight seal against leakage of Huid is maintained between said bearing and said pump casing.

10. A Huid pump comprising, a base member, driving means carried thereby, a pump body pivoted to the base member, pressure.-

creating means in said body adapted to be connected to and disconnected from the drive means by swinging the body on its pivot.

11. A Huid pump comprising, a base membcr, driving means carried thereby, a pump bodypivoted to the base member, pressure creating means in said body adapted to be connect-ed to andl disconnected from the drive means by swinging the body on its pivot. together with means for introducing the {ini-d to the pressure creating means thru the pivot.

l2. A pumpy comprising in combination pump gears. a drive shaft for one of sai gears. means whereby a fiexible connection is made between said shaft and gears, and an enlarged portion on said shaft held to its seat by the pressure discharge of the pump. 1.3. A pump comprising in combination, an internal gear and pinion', self compensating means dividing the space between the gear and pinion, an inlet to one space, an outlet from the other space, and means for driving the gear and pinion.

14. A pump including a pump body, an internal gear and pinion carried in Said body. self compensating means dividing the crescent-shaped space between the gear and pinion into two chambers, a, Huid inlet for one chamber and a pressure discharge outlet for the other chamber.

In testimony whereof, signed my name.

WILLAM H. FURNESS.

I have hereunto 

